Preamps ... no bass or treble control?

Onhwy61,

Just because your tone control is digital doesn't mean that
it is without deleterious artifacts. The tone control is
characterized by a "transfer function" - the ratio of the
Laplace transform of the output over the Laplace transform
of the input.

For a given transfer function; you can implement it either
in analog or digital. Either way - the deleterious effect
will be exactly the SAME!! The deleterious effect is a
property of the transfer function, and not whether the
implementation is analog or digital.

Dr. Gregory Greenman
Physicist

Onhwy61,

It is true that one can implement some more sophisticated
filters in a digital implementation than would be practical
in analog. Your example re: ringing is a good one. One can
implement higher-order filters that have group delays tailored
to prevent ringing - which would be prohibitive for the
equivalent analog filter.

However, more and more I see the "hawking" of digital processing
as a panacea for all audio ills. DSP can side-step some of
the ills of analog circuits - but DSP has its own set of
problems which can be just as bad [ex. Gibb's phenomenon ]
unless those that implement the technology do it carefully.

Dr. Gregory Greenman
Physicist